如何序列化 GeoPoint 颤振？

Question

flutter pub 运行 build_runner 构建在 geoPoint 上出错。错误提示：要支持类型 GeoPoint，您可以：使用 JsonConverter。我该如何实施？

class

 ...
@JsonSerializable()
class Person{
  late final String name;
  final List<Location> location;

  Person(
      {required this.uid,
      required this.name,
      required this.location});

  factory Person.fromJson(Map<String, dynamic> json) => _$PersonFromJson(json); 
  Map<String, dynamic> toJson() => _$PersonToJson(this);
}

@JsonSerializable()
class Location {
  String name;
  GeoPoint geoPoint;

  Location({required this.name, required this.geoPoint});
  factory Location.fromJson(Map<String, dynamic> json) =>
      _$LocationFromJson(json);

  Map<String, dynamic> toJson() => _$LocationToJson(this);
}

Answer 1

颜色示例：

@JsonSerializable()
class Line {
  Line({required this.name, required this.color});

  factory Line.fromJson(Map<String, dynamic> json) => _$LineFromJson(json);

  String name;

  @ColorSerializer()
  Color color;
  

  Map<String, dynamic> toJson() => _$LineToJson(this);
}

class ColorSerializer implements JsonConverter<Color, int> {
  const ColorSerializer();

  @override
  Color fromJson(int json) => Color(json);

  @override
  int toJson(Color color) => color.value;
}

你的代码应该是这样的：

@JsonSerializable()
class Line {
  Line({required this.name, required this.color});

  factory Line.fromJson(Map<String, dynamic> json) => _$LineFromJson(json);

  String name;

  @GeoPointSerializer()
  GeoPoint geoPoint;
  

  Map<String, dynamic> toJson() => _$LineToJson(this);
}

class GeoPointSerializer implements JsonConverter<GeoJson, List<int,int>> {
  const GeoPointSerializer();

  @override
  GeoPoint fromJson(List<int,int> json) => GeoPoint(x:json[0],json[1]);

  @override
  List<int,int> toJson(GeoPoint geoPoint) => [geoPoint.x,geoPoint.y];
}

如何序列化 GeoPoint 颤振？

How Serialize GeoPoint flutter?

serialization

json

flutter